Sound-modifier.



Patented Aug. 26, I902.

N. C DURAND. SUND MODIFIER.

{Application led June 14, 1902.) (No Modal;)

NTED STATES PATENT FFICE.

NELSON C. DURAND, OF SORANTON, PENNSYLVANIA, ASSIGNORTO INTER- NATIONALTEXT BOCK COMPANY, OF SCRANTON, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

SOUND-MODlFIER.

SPECIFICATEON formig part of Letters Patent No. 707,909, dated August26, 1902.

Application filed June 14:, 1902. Serial No. 111,678. (No model.)

T all wh0m it may 7w07%: To the end stated my invention consists of Beit known that I, NELSON C. DURAND, aasound-modifier,ashereinafterdescribed and oitizen of the UnitedStates,residingat Soranclaimed.

ton, in the county of Lackawanna and State The invention is illustratedin the accomof Pennsylvania, have invented new and usepanyingdrawings,t0 whioh reference is made ful Improvements in Sound Modifiers, of inthe followiug description, and in which which the following is aspecification. Figure 1 of the drawings illustrates in per- My inventionrelates to sound-modifiers, spective a sound-conveyer tube snob as orandhas for its object to provide a new and dinarilyused in connection Withphonographs 10 useful and economical device for modifying and commonlyknown as a hearing-tube, sonnd in its transmission to the ear, which isprovided withasound-escape according to my particularly useful inconnection With the invention. Fig. 2 is a similar view showingsound-conveying tubes of phonographs, but the sound-conveyer adjusted toclose the may be found useful in other relations. sonnd-escape. Fig. 3shows the same con- I5 In the practical use of phonographs the voyeradjusted t0 permit the escape of sound sonnd delivered to the ear of thehearer is and illustrating the regulable character of often harsh andnot clearly distinguishable, thesound-escape. Fig. 4 is a detached viewespecially in the transmission of recorded of the sonnd-modifier proper.speech. This is oaused, I beiieve, to some In the said drawings thereference-nu- 20 extent by the fact that the sound of the runmeral 1indicates a sonnd-conveyer tube of ning instrument is, together With thereaphonographic instrument commonly termed corded sound-waves, passedinto the sounda hearing-tube. Asound-escape 2,whichI conveyer orhearing-tube. This harshness term a sonnd-modifier, that admits of theand confusion of sound is perhaps more proescape of a portion of thevolume of sonnd- 25 nounced where the sonnd-records of the phowavespassing through the hearing-tube,is in nograph are deep or loud, aswhere they are the illustrated example of my invention inprepared insuch manner that they may be terposed in a sonnd-conveyer at a pointbeused at one time in connection With a horn, tween the sound-receivingand sound-deliverthe sound being delivered into the open air ing partsof said convoyer. The remaining 30 to be heard by a nnmoer of listeners,and at volume of sonnd passes to the ear of the lisanothertimeinconneotion withahearingtube tener in a modified or modulated formand is where the sound is confined and conveyed delivered to the ear ofthe listener in a very through a sonnd-convoyer or hearing-tube to clearand distinct way. an individual listener, who places the sonnd- Thesound-conveyer consists of a perfo- 35 deliverer element of the tube t0bis ear. rated tube 3, over Whi0h fit meeting ends l Where the sound istransmitted through a of a divided hearing-tube 1, the ends 1 ofhearing-tube to the car of the listener, the which are capable of beingbrought together harshness of the sound delivered and its conto meet andclose the soundescape or put the fused and not clearly-distinguishablequality sonnd-modifier out of operation, as in Fig. 2,

40 is moreespecially observed in the transmis as may be desirable whenthe greatest amouut 0 sion of speech from the record, where it is deofsound is to be conveyed. The ends 1 of sirable that each word shall betransmitted the convoyer are capable also of beingmoved clearly anddistinctly to the listener. away from eaoh other on the perforated tubeBy my invention the objections stated are to expose a greater or lesssurface thereof,

5 obviated, and as ancillary my sonnd-modifier whereby the sonnd-escapeor modifier may ce 5 is capable of being regulated or adjusted, asregulated t0 permit the escape of a greater or will be described, t0permit the escape of a less volume of sound-waves to meet thevarygreater or less volume of sound, as may be ing characteristics ofthe hearing sense of necessary to meet the varying characteristicsindividual listeners.

50 0E hearing of different individuals. My improved sonnd-convoyer is ofsuch a eharaeter, as will be apparent, that it ean be readily applied toexistng sound-conveyer tubes by mere1y severing the latter andinterposing the perforated tube and is of a very 5 simple and economiealnature.

Havng thus described my invention, what I claim is- A 1. The combnationof a dvided soumiconveyer, and a perforated tube interposed 1o therein.

2. In eombination with a divided soundconveyer, a perforated tubeinterposed therein, sad conveyer beng adjustable on said tube t0regu1ate the escape of sound from the conveyer.

In testimony whereof I have hereunto set my hand in presence of twosubserbing Witnasses.

NELSON C. DURAND.

Witnesses:

CLAUDE U. KRAUSE, DAVID COUTE.

